"Everyone follows me" not working properly

I’m using my own instance of Jitsi, as a teacher to distance classes. I share my desktop so that students can see and hear from my presentation. However, even though I have “everyone follows me” checked, more than half of the attendants complain that the main screen switches to whoever is speaking at the time.

Any chance that I am doing something wrong? Access to the meeting is through moodle, with the use of tokens, which means I am a moderator. Students cannot check “everyone follows me” for their part.